Re: The dreadful CLOSE_WAIT

[DervishD <raul@pleyades.net>]

    Hi Markus :)

 * Markus Schaber <schabios@logi-track.com> dixit:
> >     I know, that's the only 'harm' a CLOSE_WAIT timeout will have,
> > but anyway I don't see any point in having a permanent CLOSE_WAIT
> > state. The other end is not there, it has sent us a FIN.
> Yes, but it may still want to read.

    I know, now I understand.

> >     Well, it may be an idea ;) Anyway if you have, let's say, a
> > maximum of 10 connections in your server, and I do 10 wget+C-c, you
> > no longer have a running server. The kernel should not allow that. A
> > timeout of 3600 seconds seems very reasonable, or somethink like
> > that, am I wrong?
> Well, when the other side is really dead, then connection keepalive
> should detect that (when enabled), by either timeout or getting a reset
> packet.

    But this must be enabled in the application, am I wrong? using
SO_KEEPALIVE. Can it be enabled using sysctl or the like.

    Thanks for the information. When I saw the transitions, I thought
that the server got the FIN after the client died, but obviously it
can get it when the client doesn a half-close, and I didn't think of
it. Thanks, Markus :)

    Now, is there any sysctl that enables a keepalive for this kind
of connections (dead remote end, local in CLOSE_WAIT) for all
connections?
    
    Raúl Núñez de Arenas Coronado

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